System wakeup
The BIOS on your computer’s motherboard will typically allow you to wake up your computer without additional hardware. Almost every modern machine should have a function for time-controlled booting.
There are two methods that can be used with MythTV to wakeup your computer.
Tip: Most newer machines (year 2000 and later) should work correctly with "ACPI Wakeup" below and it is recommended that you try this method first.
ACPI Wakeup
This uses the system's ACPI subsystem and requires the presence of /sys/class/rtc/rtc0/wakealarm (current kernels, 2.6.22 and later) or /proc/acpi/alarm (older kernels, 2.6.21 and earlier).
Wake-on-LAN Wakeup
This uses the network card to listen for a "magic packet" that is sent when it is time to wake up.
nvram-wakeup
This is a small program that reads and writes the WakeUp time in the BIOS. This is done via /dev/nvram on recent kernels (>2.4.6, including 2.6.x) or, alternatively, via direct ISA access. On this WakeUp time the computer is powered on automatically.
